Quarry Business in Nigeria the Following Claims

In the drying, an inert atmosphere, such as that provided by products of combustion, should be present. And, by drawing off to a cyclone separator, suspended dust particles may be separated from the gas, so much of the latter as desired may be re-cycled to the drier,quarry business in nigeria and the recovered dust particles may be turned with the discharge particles from the drier to the bunkers, burners or other equipment which is to operate on the coal. Where it is unnecessary to dry the filtered coal, it may be by-passed in whole or in part direct from the filter to the bunkers or burners or other point of disposal as preferred. If the particle size is approximately that indicated as preferred, the drying step may generally be dispensed with.

Relatively coarse coal, as 10 to 20 mesh may also be pumped on occasion with only centrifuging and further grinding at the end of the system.Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims, or the equivalent of such, be employed.We therefore particularly point out and distinctly claim as our invention: 1. A process of treating coal, which comprises grinding coal in the presence of water to a fineness of eighty-five per cent'two hundred mesh and ninety-five per cent one hundred mesh, subjecting the product in at least one zone to treatment with bubbled air and an acid frothing agent, returning over-sized particles to the wet grinding zone, taking off the fine particles from the frothing treatment, eliminating excess of water from such particles, neutralizing the acid frothing agent and changing same to a dispersing agent, incorporating in the slurry an agent lessening its oxygenizing tendencies, pumping the resultant slurry through a pipe line to point of use, running the slurry into a storage and settling basin, drawing off the thicker coal slurry from the bottom, filtering, and drying...